Commutator brush



W. 8. CLICK. COMMUTATOR BRUSH. APPLICATION FILED-OCT. 29, I920.

Patented Aug. 15, 1922 L mZ.

WITNESSES:

A"TTORNEY heated.

and spot-wclded thereto.

I-leretofore, lIl devices of this general UNITED STATES PATENT OFFICE.

WILLIAM S. GLICK,,OF TURTLE CREEK, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

GOMMUTATOR BRUSH.

Specification of letters Patent.

Patented Aug. 15, 1922.

Application filed October 29, 1920.,Seria1 No. 420,538.

To ctZZ whom it may concern Be it known that l, \Vrnnmrvi S. CLICK, a citizen of the United States, and a resident of Turtle Creek, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Commuta tor Brushes, of which the following is a specification.

My invention relates to commutator brushes and it has particular relation to conductor or shunt attachments therefor.

One of the objects of my invention is to provide means whereby a conductor may be quickly and easily secured to a carbon com mutator brush without necessarily employing solder, bolts, amalgam or the like.

Another object of my invention is to provide means for attaching a conductor to a brush that will insure proper electrical contact therebetween under all normal conditions.

Briefly stated, my invention consists in providing a carbon brush with a screw threaded aperture adapted to receive and retain a correspondingly screw threaded sleeve member. One end of a conductor or shunt is inserted within the screw threaded sleeve character, it has been customary to employ various types offastening means for this,

purpose, such as solid rivets, screws, bolts, solder, amalgam and, the like, some of which materially added to the expense of manu:

facture. It has been observed, that, when solid rivets were employed for this purpose, great care was necessary in upsetting or riveting the ends thereof to avoid fracturing or breaking the fragile carbon brush, and that solder, when utilized, melted when the brush, from any cause, became excessively It has been further observed that certain forms of amalgam, when employed as a fastening means, lost its electrical conductivity upon a rise in temperature. When such a condition arose, all of the current passed directly to the brush-box and resulted in pitting both the brush and the box and shortening the life of each..

By my invention, I provide means for attaching a conductor to a carbon brush that w1ll avoid the disadvantages heretofore e11- countered. I

v In accompanying drawings,

Fig. l is a view, partially in vertical longitudinal section and partially in side elevation, of a commutator brush embodymg my invention.

Fig. 2 is a top plan view of the structure illustrated in Fig. 1.

Fig. '8 is a vertical sectional view, on an enlarged scale, of the screw threaded sleeve member illustrating a conductor spot-welded therein.

Referring to the drawings, 1 indicates a commutator brush, of any preferred com position or material. A substantially vertically disposed screw threaded aperture is drilled, molded, or otherwise suitably formed in the upper portion of the brush. The aperture 2 is preferably disposed adjacent to one side of the brush to permit of the unobstructed operation of the customary resilient brush linger, not shown.

One end of a conductor or shunt 3 is inserted within an exteriorly screw threaded sleeve 4 and is spot-welded thereto, at its lower extremity, as is indicated at 5. The

sleeve is then tightly screwed into the aper,

terial having a relatively high coefficient of electrical conductivity disposed intermediate said retaining means and said brush.

2. A commutator brush having ascrewthreaded aperture formed therein, an ex teriorly screw threaded tubular member disposed within said aperture, and a conductor having one end thereof disposed within said tubular member and welded thereto at its lower extremity, and a conducting manmterial having a relatively high coellleient of electrical conductivity disposed interimdia'te Said fastening member and said ln'mh 10 In testimony whereof, I have hereunto subscribed my name this 25th clay of Outober 1920.

\VILLIAM GL1 (1K. 

